Shurikenger's one of only two things Hurricanger has going for it (Oboro was the other). His gimmick of using older sentai people was cool, but it still would have been nice to have seen his true identity that wasn't a CGI silhouette. I remember a Japanese site that had a poll of which former sentai star would be the best and Jun'ichi Haruta was at number one -- which would have been awesome.
And it may not have been the voice of ninja of (all) ninjas, but I think Taiki Matsuno's pretty damn funny.